1.
Barely visible or cloudy diffused matter, such as mist, fumes, or smoke, suspended in the air.
2.
a. The state of a substance that exists below its critical temperature and that may be liquefied by application of sufficient pressure. b. The gaseous state of a substance that is liquid or solid under ordinary conditions.
3. a. The vaporized form of a substance for use in industrial, military, or medical processes. b. A mixture of a vapor and air, as the explosive gasoline-air mixture burned in an internal-combustion engine.
4. Archaic. a. Something insubstantial, worthless, or fleeting. b. A fantastic or foolish idea.
5. vapors Archaic. a. Exhalations within a bodily organ, especially the stomach, supposed to affect the mental or physical condition. Used with the. b. A nervous disorder such as depression or hysteria. Used with the.
To vaporize.